Fire door



P. F. CROSBY FIRE DOOR Oct. 10,1967

5 Sheets-Sheet 1 Filed Aug. 25, 1965 I9 I E V INVENTOR.

PETER ECROSBY BY FIG. I

ATTORNEY.

P. F. CROSBY Oct. 1o, 19s7 FIRE DOOR 5 Sheets-Sheet 2 Filed Aug. 25. 1965 FIG. 3

JNVENY 'OR. PETER ECRO'SBY ATTO R NEY.

Oct. 10,1967 P. F. CROSBY 7 FIRE noon Filed Aug. 25, 1965 5 Sheets-Sheet s INVENTOR.

PETER F; CROSBY ATTORNEY.

P. F. CROSBY Oct. 10,1967

FIRE DOOR 5 Sheets-Sheet 4 Filed Aug. 25. 1965 INVENTOIR. PETER ECROSBY ATTOR NEY.-

P. F. CROSBY Oct. 10, 1967 FIRE DOOR 5 heets-Sheet 5 Filed Aug. 25. 1965 INVENTOR.

?ETE R F. CROSBY "FIG. 8

nited States Patent 6 3,345,775 FIRE DOOR Peter F. Crosby, Cazenovia, N.Y., assignor, by mesne assignments, to Diebold Incorporated, Canton, Ohio, a corporation of Ohio Filed Aug. 25, 1965, Ser. No. 482,437 1 Claim. (Cl. 49-4) ABSTRACT OF THE DISCLOSURE A vertically slidable fire door, a pair of constant force coiled band springs, the combined force of the springs being suflicient only to hold the door from descending by gravity, one spring is fixedly secured to the doorthe other spring is connected to the door by a fusible link.

This invention relates to door structures intended particularly for use in buildings, the structure including a fire resistant door, which is operable, at above normal ambient temperature, to move to closed position.

The invention has as an object a fire door structure embodying an arrangement particularly economical to construct and install and wherein the door may be conveniently and readily moved manually to open and closed position, and which will move automaticaly to closed position if the ambient temperature rises above a predetermined value.

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed.

In describing this invention, reference is made to the accompanying drawings in which like characters designate corresponding parts in all the views.

In the drawings- FIGURE 1 is a front elevational view of a door structure embodying my invention.

FIGURE 2 is a view showing the rail structure in side elevation looking to the left, FIGURE 1, and with the door frame in vertical section.

FIGURE 3 is a View taken on line 3-3, FIGURE 1.

FIGURE 4 is a view taken on line 4-4, FIGURE 1.

FIGURE 5 is a view taken on line 55, FIGURE 1.

FIGURE 6 is a view taken on line 66, FIGURE 1.

FIGURE 7 is a view taken on line 7-7, FIGURE 1.

FIGURE 8 is a view taken on line 8-8, FIGURE 6.

The door structure includes a frame having side members 10 provided with tie strips 11 for embeddment in a wall structure. The side members 10 are formed with flanges 12 along their front edges, the flanges 12 being bent inwardly, as at 13, for engagement with the wall structure. The inner edges of the side members 10 are formed with flanges 14 overlying the inner surface of the wall structure.

An opening sill 17 is positioned between the lower ends of the side members 10 and is formed at its front edge with a depending flange 18 terminating in an inwardly bent flange 19, see FIGURES 2 and 3. The sill 17 is secured to the side members 10, as by angle members 20. A header 23 is positioned between the upper ends of the side members 10 and is secured thereto by angle mem-' bers 25, see FIGURES 2 and 5. The header is formed along its forward edge with an upwardly extending flange 27 which terminates in an inwardly bent flange 28 extending into the wall structure. The side members 10, sil] 17 and header 23, form a door opening.

Referring to FIGURE 4, the inner flanges 14 of the side members 10 are provided with apertures to receive bolts 31) which serve to attach vertically disposed door guide members 31 to the side members 10. The guide ice members include channel pieces 31, FIGURE 4. Plates 32 are aflixed to the outer side flanges of the rails 31, as by welding. The plates 32 extend upwardly from the sill 17 to the header 23, see FIGURE 2.

There is fixedly secured to the lower end portion of each of the guide rails 31 a plate 33. A similar plate 34 is fixedly secured to the intermediate portion of the rails 31 in the area at the upper ends of the side members 10. The plates 33, 34 are also fixedly secured to the plates 32, the plate 33 extending a distance below the lower ends of the rails 31. The upper plates 34 extend a short distance above the upper ends of the plates 32, see FIGURES 1, 2, 3 and 5.

The lower plates 33 are apertured to receive bolts 37 employed to attach a crosspiece 40 to the plates 33. The crosspiece 40 has aflixed to it a bottom channel member 41 arranged in registration with the vertical channels 32. The upper plates 34 serve to attach a cross member 43, FIGURE 5.

The plates 32 are attached to the flanges 14 of the side members 10 by the bolts 20, which extend through spacers 45 and through tubular members 47, rectangular in cross section, see FIGURE 4.

The tubular members 47 extend downwardly from the frame and rail assembly and are provided at their lower ends with angle foot members 48 fastened into the floor structure 49, see FIGURE 3. The members 47 serve as temporary legs to support the frame and rail assemblies while the masonry wall structure 50 is being constructed, the assemblies being secured in the wall structure by the tie members 11, which are embedded in the wall structure during the erection.

A rectangular door member 51 is mounted for vertical sliding movement in the channels 31. In FIGURES 1 and 3, the door is shown in down or closed position forming a closure for the opening provided by the side members 10, sill 17 and header 23.

A bar 52 extends transversely of the rails 31, and is secured to the upper ends thereof as by bolts 53, see FIGURES 1 and 2. A circular drum 54 is journalled on a stud 55 fixedly mounted in the crosspiece 52 by nuts 57, 58, see FIGURES 6 and 8. A disk 59 is positioned on the stud 55, at the outer end of the drum, and is of greater diameter of the drum to provide a flange for retaining a constant force band spring 60 coiled on the drum 54. It will be seen referring to FIGURES l and 8, there are two drums and accordingly there are two of the constant force coiled band springs 60. One of these springs is attached directly to the top of the door 51 by an S hook 63, see FIGURE 1, this connection being made by the S hook hooking into an angle bracket attached to the upper edge of the door 51, as by screw 66, see FIGURE 5. The upper end of the hook member 63 is hooked through an aperture 67 in the lower end of the spring 60. The other spring 60 is connected to the door by means of a fusible link 69, see FIGURE 7.

wardly in the rails 31 to the closed position. The door- 51 is of hollow sheet metal construction and is filled with insulating material 70.

Due to the fact that the constant force springs 60 function to only counterbalance the door, the door may be lowered and raised manually with substantially no exertion or effort.

When the frame and rail assembly are mounted on the leg members 47, a sheet metal shield 73 is affixed to the upper portions of the rails 31 extending upwardly from the cross member 43. This shield serves to prevent mortar and the like from getting into the guide rails 31 during the formation of the Wall structure 50.

What I claim is:

A fire door structure comprising a frame having vertically disposed spaced apart guide members, a door mounted for sliding movement in said guide members, a pair of constant force coiled band springs mounted in the upper portion of said frame, the free end of one of said springs being fixed to said door, the free end of the other spring of said pair being connected to said door by a fusible link, the springs of said pair exerting a com- References Cited UNITED STATES PATENTS 583,492 6/1897 Lane 49-5 2,239,104 4/1941 Kern 49-7 2,635,282 4/1953 Trammell et a1. 16-197 DAVID J. WILLIAMOWSKY, Primary Examiner.

HARRISON R. MOSELEY, Examiner.

I. K. BELL, Assistant Examiner. 

